Connected: An Internet Encyclopedia
RFC 1661 - 3.2. Phase Diagram

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### 3.2. Phase Diagram

In the process of configuring, maintaining and terminating the point-to-point link, the PPP link goes through several distinct phases which are specified in the following simplified state diagram:

       +------+        +-----------+           +--------------+
       |      | UP     |           | OPENED    |              | SUCCESS/NONE
       | Dead |------->| Establish |---------->| Authenticate |--+
       |      |        |           |           |              |  |
       +------+        +-----------+           +--------------+  |
          ^               |                        |             |
          |          FAIL |                   FAIL |             |
          +<--------------+             +----------+             |
          |                             |                        |
          |            +-----------+    |           +---------+  |
          |       DOWN |           |    |   CLOSING |         |  |
          +------------| Terminate |<---+<----------| Network |<-+
                       |           |                |         |
                       +-----------+                +---------+

Not all transitions are specified in this diagram. The following semantics MUST be followed.

Next: 3.3. Link Dead (physical-layer not ready)

Connected: An Internet Encyclopedia
RFC 1661 - 3.2. Phase Diagram